<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<script type="text/javascript">    
    function refresh() {    
        //IE存在缓存,需要new Date()实现更换路径的作用    
        document.getElementById("image").src="Base_createImageAction.action?+ Math.random()"+new Date();    
    }    
</script> 
</head>
<body>
测试
	<form action="Base_User_UserLogin" method="post">
		<input name="UserName" type="text"><br/>
		<input name="password" type="password"><br/>
		<input name="checkCode" type="text">
		<img id="image" border="0"  onclick="refresh()"  src="Base_createImageAction.action" title="看不清，换一张">
		<input type="submit">
	</form>
</body>
</html>